Here's what I would do provided the site has historical significance or you have already found items there to verify there is potential. Go over it the best you can using low iron mask with the stock coil, digging all non-ferrous signals, then if you have time go at the same area 90 degrees from the first search. You have to take a lot of chances on iffy signals that may only repeat at one angle. I would use audio 1 and dig any signal that tells you it isn't iron or until you can figure out the tone pattern iron signals are making that is fooling you, then you can avoid not digging those.
While you are searching, keep checking your depth meter and if it stays halfway up on the meter or higher then you need to get a 5" coil and work the same area again, at least the best you can, using the same techniques above. Finally, if you have another single freq detector with at most a 5 or 6" coil that works good in nails, check the area out. I did all this, this past hunting year and came away with a lot of buttons and some bullets, and a few IH's, v-nickels and other items. My other detector I was using is an IDX-Pro fitted with a 6" coil, it did well too but I have more comfidence in the Explorer with extra coils, I was mainly using the other detector to double check smaller areas, and also hunted some smaller areas with it first.
This area was difficult because there was so much iron, iron of all kinds, shapes but I knew I really had to work it hard to make the finds, oh yes, I dug a bunch of splattered lead, shotgun hulls, modern rifle lead, buckshot and some alum, etc but digging no trash will get no stash in trashy areas.
That's my opinion if you are serious about the area, hope this helps.